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Honeywell MagicStat thermostat - questions about jumper settings on theback
I've got a Honeywell MagicStat thermostat that has 2 jumpers marked as
"A" and "B" that are opened or closed by a screw head that you tighten (to close the jumper) or turn out (to open the jumper). There are 2 other jumpers (C and D) - C is to set Celcius or Farenheight, but I don't know what "D" is for (there is no screw for that one - so it's open). I can find no reference anywhere what D could be for. I'm not quite sure what exact model of MagicStat I have - there is absolutely no number or name stamped or printed on this thing. Not even the word "MagicStat". I've seen models like 28, 1000, 2800 and 3200 from web searches. I believe this one was purchased between 1996 and 1999. This is the most similar picture I could find of the front panel: http://img.ehowcdn.co.uk/article-pag...10-800x800.jpg And this is the best picture for the entire unit: http://www.honeywellcentral.com/medi...A1001-U_lg.jpg The thermostat is controlling a 20+ year-old GE "Whisper-heat" natural gas furnace. This is NOT a high-efficiency (or condensing) furnace, but it does have an electronic control module, combustion damper gate and electronic ignition. The furnace is cycling too often to suit me, and so I'd like to know if the thermostat can be modified to solve that. The written documentation for the A and B jumpers are as follows: Warm Air Furnace: Set at the Hot Water setting (A-out, B-in) Electric furnace: Leave at the Warm Air Furnace setting (A-in, B-in) (the way the second line reads is confusing) It also says: For high efficiency (90% AFUE): A-out, B-in On the back of the unit these instructions are stamped into the plastic case: Warm Air Furnace: A-in, B-in, Fuel Switch F Hot Water Boiler: A-out, B-in, Fuel Switch F Electric Furnace: A-in, B-out, Fuel Switch E On my thermostat, the current settings a Warm Air Furnace: A-in, B-in, Fuel Switch F I believe that the only thing the Fuel Switch does is turn on the fan when heat is called for (in the E setting) otherwise the fan is turned on by the furnace (in the F setting). So if anyone knows, I'd like some clarification as to how exactly the A and B settings work or how they modify the operation of the furnace. It would be nice if there was a SPAN or hysteresis setting so I could force a 1 or 2 degree swing so the cycles last longer, but I see no such setting. I'm wondering if the A and B settings can accomplish this? And - anyone know what the D jumper does? |
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